Engine



(No Mdel.)

'I'. R. HILL.

ENGINE. No. 576,191., f 3 Patented Feb. 2, 1897.

Urxurnnr STATES PATENT "OFFICE'.

THOMAS ROBY HILL, VOF PHILADELPHIA, PENNSYLVANIA, ASSIGNORTO THEOHOUTEAU MANUFACTURING COMPANY, OF MISSOURI.

ENGINE.

SPECIFICATION forming part of Letters Patent N o. '576,191, datedFebruary 2, 11897. Application filed July 15, 189B. Serial No. 599,232.(No model.)

.To all whom, it may concern:

Beit known that I, THoMAs ROBY H1LL,a citizen of the United States,residing at the city of Philadelphia, county of Philadelphia, 5 State ofPennsylvania, have invented a certain newand'usefnl Improvement inEngines,

of which the following is a full, clear, and ex-v zo are designed moreparticularly to be run by compressed air as the motive iinid. Ihe frontend of the cylinderl is formed with an-opening to receive the end of achisel or like tool,

upon which the piston delivers impactingl 4z5 blows.

The engine is designed for use in cutting and carving stone, calkingboilers, (be.

The special features of the invention which form the subject-matter ofthis present application reside in the construction of the cylinder,thesleeve, and the head-block,which cooperates with the cylinder and sleeveto hold the latter in position, there being suitpendent rotation of 'theparts after they are once assembled.

`Another feature of the inventionl resides in the instruction-ofthefront end of the cylinder ivhereby the end of the tool-shank may beinserted to receive the blow from the piston Without being reduced inits diameter. Other features of the invention reside in theconstruction, arrangement, and.combina tion/of the several parts, all aswill hereinafter be described, and afterward pointed out in the claims.

In the drawings, A indicates the cylinder,-

4 bored to receive a suitable piston B. The piston shown in thisapplication is provided able provision made for' preventing inde` withports with which cooperate suitable cyl- 5o inderports substantiallylike those shown and described Ain United States Letters Pat-` ent No.542,498, dated July 9, 1895, granted to Pierre Chouteau, Aassignee .ofFrank C. Rinsche, and I do not, therefore, claim the same here -as myinvention, nor do I desire to be understood as limiting myself tothispar ticular form of piston or port arrangements,

as there are other forms of` pistons and port arrangements which couldbe used in connec- 6o tion with my invention. The forward end of thecylinder is bored for the passage of the lpiston-stein, the cxtremeforward end of the cylinder being bored to alarger diameter to receive asleeve or bushing C, in which the end of the chisel (not shown.) isAinserted. The inner'end of this sleeve is formed with aninwardly-projecting flange c, which is of greater diameter `than thepiston-stem open# ing leading from the'piston-chamber. In the 7ocylinder and connected with this space be tween the piston-stem andsleeve-'delige is an opening A. The object of so constructing` thecylinder and sleeve'is to enable the piston-stem to strike a' blow offulllstrength on 75 the end of the chisel or like tool Without beinginfluenced by the compression or suction of air which would occur wereit not for this communication with the exterior. Again,

by so enlarging the diameter of the vsleeve l8o and forming a flange atits rear'end it is not necessary that the chisel-shank should be reducedto form a shoulder which would act as a stop to prevent the chiselfollowing the piston-stein in its movement to the rear, said flange ehere acting as a stop, which thereby greatly reduces the cost ofproduction of .chisels to bel used in connection with an eneine.

a The forward end of the cylinder is formed 9o with a shoulder a,against which'abuts a sleeye .D, saidsleeve extending rearwardly beyondthe cylinder.` In order to prevent independent rotation of either thesleeve or the cylinder when said parts are assembled,l I seat a suitableplug orV pin d in the cylinder, which pin isreceived in a recess ornotch di in the forward end of the sleeve D.

' crease the area ofthe port.

In the construction of engines where a sleeve has been employed inconnection with the cylinder, between which parts were formed theseveral cylinder-ports, it has been the practice heretofore, so far as Iam aware, to form said ports in such a manner that the sleeve or thecylinder, as the case might be, would have to bridge a. considerablespace and be unsupported at the point of said ports. This isobjectionable in this that in the rough handling of the tool the sleeve,being unsupported for some considerable portion of its diameter, wouldbecome indented and, perhaps, "form a leak which would detract from theeciency of the engine. Besides if the indentation is deep enough it willde- I have overcome this objection by 'forming the ports between thecylinder and sleeve of a number of grooves which have a rib between themto support the sleeve. These grooves are connected together by the portswhich lead into the cyll inder, and said grooves may extend to the endof the cylinder, as shown in Fig. 3, or they may terminate short oftheend of the cylinder, as shown at the right in Fig. l.

E indicates a head-block which is formed with a shoulder e, adapted totit against the rear end of the sleeve and clamp said sleeve inposition. The forward end of this headblock is'threaded and receivedinto the rear end of the cylinder. The head-block is so formed thatthere is a chamber or space left therebetween and the rear end of thecylinder, into which space lead the grooves forming the exhaust-ports.Leading from this space are openings e in the head-block, said openingsbeing sc arranged side by-side that by covering one or more of saidopenings the exhaust willbe choked and the speed of the enginecontrolled.

F indicates an inlet-passage formed in the head-block E, said passageleading to the chamber F', formed at the forward end of said head-blockby reducing its diameter, as shown in Figs. l and. The object of formingthis circular chamber around the head-block is that when the head-blockis screwed into the cylinder its proper distance, no matter what rotaryposition it'may occupy, it will still register withl the cylinderinlet-port.

' In order to prevent rotary movement of the head-,block after it hasbeen seated home, I mount in a suitable bore formed therein aspring-pressed locking-pin G, which engages with a notch g, in the rearend of the sleeve D. The head-block is slotted, so that a projectionon-jthe locking-pin may pass through to enable ,the pin to be withdrawnfrom its engagement with the sleeve when it is desired to disassemblethe tool.

`From the above it will be seen that a tool constructed as shown in thedrawings is simple,-,.cheap of cost, and compact. There is verylittledanger of the tool becoming loosened after it is once assembled, and byforming the cylinder-ports by Igroups of grooves, as shown, it will beseen that the cylinder supports the sleeve practically at all points ofits periphery, and therefore there is very little danger of the sleevebecoming indented from rough usage. A Y

Having thus described my invention, what I claim, and desire to secureby Letters Patent of the United States, is-

l. The combination with the cylinder, of apiston formed with a stem onits forward end, and a sleeve or bushing having an internal ange at itsrear end, t-he opening in the rear end of said sleeve being of largerdiameter than the stem of the piston so as to leave a space between thetwo, and an opening in the cylinder connecting said opening in the rearof the sleeve with the exterior; substantially as described.

formed with a shoulder near its front end, of

a sleeve which abuts against said shoulder, "said sleeve being formedwith a recess 1n its forwardY end for receiving a pin seated in a recessin the cylinder, a head threaded in the rear end of the cylinder, ashoulder formed onv the head for abutting against the sleeve andclamping it in position, and a springpressed locking-bolt arranged inthe head and adapted to engage a natch in the rear end of the sleeve;substantially described.

3. The combination with the cylinder, of a sleeve surrounding the same,a head for engaging said parts, there being. a chamber formed betweenthe end of the cylinder and head, into which chamber leads the exhaust,and twc cr more holes formed in the head leading from said chamber,whereby, the escape of the exhaust may be controlled; sub

lstantially as described.

2tits into the rear end of the cylinder, and also engages the sleeve,there being a chamber formed between the end of the cylinder and head,into which chamber leads the exhaust,

and a reducedportion in the front end of the head, which forms a chamberfor the motive iuid; substantially as described,

5. The combination with a cylinder, of a head which lits into the rearend of the same, said head being formed with an inlet-passage, whichleads to a chamber formed in the front end of the head, said head havingits diameter reduced to form the chamber; substan-' tially as described.

6. The combination with the cylinder which is formed with corrugationson its outer periphery to which lead ports from the interior, and asleeve surrounding said cylinder; substantially as described.

7. The combination with the cylinder which is grooved longitudinally,said grooves being separated by a rib or partition, aport or ports.

IOC

Ipo:

IIC

@miei s LL continuous bearing'aiound the cylinder; substantially asdescribed.

8;. The combination with the eylilider Whose periphery is grooved, saidgrooves being grouped, ports connecting Said groups with the in terior,and all of the grooves of a group together, and a Sleeve surrounding theeyl- 1o inder; substantially as described.

In testimony whereof hereunto affix my signature, in presence of twoWitnesses, this 27th day of June, 1896.

THOMAS ROBY HILL. llfitiiesses:

- J. F. LYNCH,

Lome L. DREW

